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Wang J, Li M, Nan N, Ma A, Ao M, Yu J, Wang X, Han K, Yun DJ, Liu B, Li N, Xu ZY. Os GADD45a1: a multifaceted regulator of rice architecture, grain yield, and blast resistance. Plant Cell Rep 2024; 43:88. [PMID: 38461436 DOI: 10.1007/s00299-024-03191-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 02/29/2024] [Indexed: 03/12/2024]
Abstract
KEY MESSAGE The homolog gene of the Growth Arrest and DNA Damage-inducible 45 (GADD45) in rice functions in the regulation of plant architecture, grain yield, and blast resistance. The Growth Arrest and DNA Damage-inducible 45 (GADD45) family proteins, well-established stress sensors and tumor suppressors in mammals, serve as pivotal regulators of genotoxic stress responses and tumorigenesis. In contrast, the homolog and role of GADD45 in plants have remained unclear. Herein, using forward genetics, we identified an activation tagging mutant AC13 exhibited dwarf characteristics resulting from the loss-of-function of the rice GADD45α homolog, denoted as OsGADD45a1. osgadd45a1 mutants displayed reduced plant height, shortened panicle length, and decreased grain yield compared to the wild-type Kitaake. Conversely, no obvious differences in plant height, panicle length, or grain yield were observed between wild-type and OsGADD45a1 overexpression plants. OsGADD45a1 displayed relatively high expression in germinated seeds and panicles, with localization in both the nucleus and cytoplasm. RNA-sequencing analysis suggested a potential role for OsGADD45a1 in the regulation of photosynthesis, and binding partner identification indicates OsGADD45a1 interacts with OsRML1 to regulate rice growth. Intriguingly, our study unveiled a novel role for OsGADD45a1 in rice blast resistance, as osgadd45a1 mutant showed enhanced resistance to Magnaporthe oryzae, and the expression of OsGADD45a1 was diminished upon blast fungus treatment. The involvement of OsGADD45a1 in rice blast fungus resistance presents a groundbreaking finding. In summary, our results shed light on the multifaceted role of OsGADD45a1 in rice, encompassing biotic stress response and the modulation of several agricultural traits, including plant height, panicle length, and grain yield.
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Affiliation(s)
- Jie Wang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Mengting Li
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Nan Nan
- College of Plant Protection, Jilin Agricultural University, Changchun, 130118, China
| | - Ao Ma
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Min Ao
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Jinlei Yu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Xiaohang Wang
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Kangshun Han
- Rice Institute, Tonghua Academy of Agricultural Science, Tonghua, 135007, China
| | - Dae-Jin Yun
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
- Department of Biomedical Science and Engineering, Konkuk University, Seoul, 132-798, South Korea
| | - Bao Liu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China
| | - Ning Li
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China.
| | - Zheng-Yi Xu
- Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China.
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Lakshmi Ch NP, Sivagnanam A, Raja S, Mahalingam S. Molecular basis for RASSF10/NPM/RNF2 feedback cascade-mediated regulation of gastric cancer cell proliferation. J Biol Chem 2021; 297:100935. [PMID: 34224728 PMCID: PMC8339327 DOI: 10.1016/j.jbc.2021.100935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 06/12/2021] [Accepted: 06/29/2021] [Indexed: 12/05/2022] Open
Abstract
Ras-association domain family (RASSF) proteins are encoded by numerous tumor suppressor genes that frequently become silenced in human cancers. RASSF10 is downregulated by promoter hypermethylation in cancers and has been shown to inhibit cell proliferation; however, the molecular mechanism(s) remains poorly understood. Here, we demonstrate for the first time that RASSF10 inhibits Cdk1/cyclin-B kinase complex formation to maintain stable levels of cyclin-B for inducing mitotic arrest during cell cycle. Using LC-MS/MS, live cell imaging, and biochemical approaches, we identify Nucleophosmin (NPM) as a novel functional target of RASSF10 and revealed that RASSF10 expression promoted the nuclear accumulation of GADD45a and knockdown of either NPM or GADD45a, resulting in impairment of RASSF10-mediated G2/M phase arrest. Furthermore, we demonstrate that RASSF10 is a substrate for the E3 ligase ring finger protein 2 (RNF2) and show that an NPM-dependent downregulation of RNF2 expression is critical to maintain stable RASSF10 levels in cells for efficient mitotic arrest. Interestingly, the Kaplan–Meier plot analysis shows a positive correlation of RASSF10 and NPM expression with greater gastric cancer patient survival and the reverse with expression of RNF2, suggesting that they may have a role in cancer progression. Finally, our findings provide insights into the mode of action of the RASSF10/NPM/RNF2 signaling cascade on controlling cell proliferation and may represent a novel therapeutic avenue for the prevention of gastric cancer metastasis.
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Affiliation(s)
- Naga Padma Lakshmi Ch
- Laboratory of Molecular Cell Biology, National Cancer Tissue Biobank, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai, India
| | - Ananthi Sivagnanam
- Laboratory of Molecular Cell Biology, National Cancer Tissue Biobank, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai, India
| | - Sebastian Raja
- Laboratory of Molecular Cell Biology, National Cancer Tissue Biobank, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai, India
| | - Sundarasamy Mahalingam
- Laboratory of Molecular Cell Biology, National Cancer Tissue Biobank, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai, India.
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Chen M, Wu HL, Wong TS, Chen B, Gong RH, Wong HLX, Xiao H, Bian Z, Kwan HY. Combination of Wogonin and Artesunate Exhibits Synergistic anti-Hepatocellular Carcinoma Effect by Increasing DNA-Damage-Inducible Alpha, Tumor Necrosis Factor α and Tumor Necrosis Factor Receptor-Associated Factor 3-mediated Apoptosis. Front Pharmacol 2021; 12:657080. [PMID: 34025421 PMCID: PMC8131852 DOI: 10.3389/fphar.2021.657080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 03/29/2021] [Indexed: 02/01/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is difficult to treat, and is the second leading cause of cancer-related death worldwide. This study aimed to examine whether combination of wogonin and artesunate exhibits synergistic anti-HCC effect. Our data show that the combination treatment exhibits synergistic effect in reducing HCC cell viability by increasing apoptosis as indicated by the elevated cleavage of caspase 8, 3 and PARP. Interestingly, PCR array and the subsequent studies indicate that the combination treatment significantly increases the expression of DNA-damage-inducible, alpha (GADD45A), tumor necrosis factor (TNFα) and TNF receptor-associated factor 3 (TRAF3). Knockdown of GADD45A, TNFα or TRAF3 abolishes the combination treatment-enhanced apoptosis and the synergistic effect in reducing HCC cell viability. In the HCC-bearing xenograft mouse models, although the combination treatment increases the activity of NFκB in the tumor tissues, it exhibits a more potent anti-HCC effect than the mono-treatment, which may due to the enhanced apoptosis as indicated by the increased expression of GADD45A, TNFα, TRAF3 and apoptotic markers. Our study clearly demonstrates that the combination of artesunate and wogonin exhibits synergistic anti-HCC effect, and support the further development of this combination as alternative therapeutics for HCC management.
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Affiliation(s)
- Minting Chen
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Hsin Ling Wu
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Tsz Sin Wong
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Baisen Chen
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Rui-Hong Gong
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Hoi Leong Xavier Wong
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Haitao Xiao
- School of Pharmaceutical Sciences, Health Science Center, Shenzhen University, Shenzhen, China
| | - Zhaoxiang Bian
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
| | - Hiu Yee Kwan
- Centre for Cancer and Inflammation Research, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
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Jang HJ, Yang JH, Hong E, Jo E, Lee S, Lee S, Choi JS, Yoo HS, Kang H. Chelidonine Induces Apoptosis via GADD45a-p53 Regulation in Human Pancreatic Cancer Cells. Integr Cancer Ther 2021; 20:15347354211006191. [PMID: 33884928 PMCID: PMC8077490 DOI: 10.1177/15347354211006191] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Chelidonium majus has been used as a traditional medicine in China and western countries for various diseases, including inflammation and cancer. However, the anti-cancer effect of chelidonine, a major compound of C. majus extracts, on pancreatic cancer remains poorly understood. In this study, we found that treatment with chelidonine inhibited proliferation of BxPC-3 and MIA PaCa-2 human pancreatic cancer cells. Annexin-V/propidium iodide staining assay showed that this growth inhibitory effect of chelidonine was induced through apoptosis. We found that chelidonine treatment upregulated mRNA levels and transcription factor activity in both cell lines. Increases in protein expression levels of p53, GADD45A, p21 and cleaved caspase-3 were also observed, with more distinct changes in MIA PaCa-2 cells compared to the BxPC-3 cells. These results suggest that chelidonine induces pancreatic cancer apoptosis through the p53 and GADD45A pathways. Our findings provide new insights into the use of chelidonine for the treatment of pancreatic cancer.
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Affiliation(s)
- Hyun-Jin Jang
- Korea Basic Science Institute, Daejeon,
Republic of Korea
- Sungkyunkwan University, Suwon,
Republic of Korea
| | - Jae Ho Yang
- Daejeon Korean Medicine Hospital of
Daejeon University, Seoul, Republic of Korea
| | - Eunmi Hong
- Korea Basic Science Institute, Daejeon,
Republic of Korea
| | - Eunbi Jo
- Korea Basic Science Institute, Daejeon,
Republic of Korea
- Hanyang University, Seoul, Republic of
Korea
| | - Soon Lee
- Korea Basic Science Institute, Daejeon,
Republic of Korea
- University of Science and Technology,
Daejeon, Republic of Korea
| | - Sanghun Lee
- Korea Institute of Oriental Medicine,
Daejeon, Republic of Korea
| | - Jong Soon Choi
- Korea Basic Science Institute, Daejeon,
Republic of Korea
| | - Hwa Seung Yoo
- Daejeon Korean Medicine Hospital of
Daejeon University, Seoul, Republic of Korea
- Hwa Seung Yoo, East West Cancer Center,
Seoul Korean Medicine Hospital of Daejeon University, Seoul 05836, Rep. of
Korea.
| | - Hyuno Kang
- Korea Basic Science Institute, Daejeon,
Republic of Korea
- Hyuno Kang, Division of Analytical Science,
Korea Basic Science Institute, 169-148, Gwahak-ro, Yuseong-gu, Daejeon 34133,
Republic of Korea.
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Salem EA, Elhalafawy IA, Hegazy MM, Younis FE, Swellim OA, Sakr MA. Altered tumor suppressor genes expression in Egyptian pesticide applicators exposed to organophosphate insecticides. Toxicol Ind Health 2020; 36:558-566. [PMID: 32869731 DOI: 10.1177/0748233720940538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Occupational exposure in spraying and application of non-arsenical insecticides has been classified as a probable human carcinogen. The fundamental molecular mechanisms involved the tumor-related genes. This study aimed to investigate the carcinogenesis effects related to chronic exposure to organophosphate (OP) pesticides in pesticide applicators. This was a cross-sectional study conducted on 27 pesticide applicators and 24 matched controls through the period from June to December 2018. The level of acetylcholinesterase (AChE) was determined and the effects of OPs exposure on messenger RNA (mRNA) expression of the DNA-damage responsive genes P53, P21, GADD45a, and MDM2 were determined using real-time quantitative polymerase chain reaction. A significant reduction of serum AChE enzyme activities was observed in chronically exposed subjects in comparison with the control group (p = 0.001). The expression of P53, P21 mRNA was significantly downregulated in the exposed group compared with the healthy nonexposed control group (p < 0.05). Conversely, the expression of MDM2 and GADD45a did not significantly differ between the exposed subjects and the control group (p > 0.05). No significant differences were noted between the exposed and control groups regarding the genotype or allele distributions of P53 Arg72Pro polymorphism. These results suggested that chronic exposure to OP insecticides may have mitogenic and carcinogenicity activity for the exposed cases due to downregulation of P53 and P21 but did not demonstrate any DNA damage properties for the exposed cases, and finally, a regular follow-up of the exposed cases for tumor markers is recommended.
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Affiliation(s)
- Eman A Salem
- Industrial Medicine and Occupational Health, Department of Public Heath and Community Medicine, Faculty of Medicine, 68872Menoufia University, Al Minufiyah, Egypt
| | - Ibrahim A Elhalafawy
- Department of Molecular Diagnostics and Therapeutics, Genetic Engineering and Biotechnology Research Institute, 392053University of Sadat City, Sadat City, Egypt
| | - Mofrih M Hegazy
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, 68872Menoufia University, Al Minufiyah, Egypt
| | - Faten E Younis
- Industrial Medicine and Occupational Health, Department of Public Heath and Community Medicine, Faculty of Medicine, 68872Menoufia University, Al Minufiyah, Egypt
| | - Ola A Swellim
- Department of Forensic Medicine and Clinical Toxicology, Faculty of Medicine, 68872Menoufia University, Al Minufiyah, Egypt
| | - Moustafa A Sakr
- Department of Molecular Diagnostics and Therapeutics, Genetic Engineering and Biotechnology Research Institute, 392053University of Sadat City, Sadat City, Egypt
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Han N, Yuan F, Xian P, Liu N, Liu J, Zhang H, Zhang H, Yao K, Yuan G. GADD45a Mediated Cell Cycle Inhibition Is Regulated By P53 In Bladder Cancer. Onco Targets Ther 2019; 12:7591-7599. [PMID: 31571910 PMCID: PMC6754676 DOI: 10.2147/ott.s222223] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 09/04/2019] [Indexed: 11/23/2022] Open
Abstract
Background Bladder cancer (BC) is one of the most prevalent malignancies of the genitourinary system, yet the underlying mechanism of BC progression still remains unclear. Growth arrest and DNA damage-inducible 45 alpha (GADD45a) is a repressive gene implicated in cell cycle regulation, as well as in human cancers development. However, its role in BC remains to be determined. Methods First, quantitative real-time polymerase chain reaction (PCR) and Western blot assays were used to detect GADD45a expression in BC tissues and adjacent non-tumor tissues, as well as in bladder cancer cell lines, respectively. Then, cell counting kit-8 (CCK-8) assays, colony formation assays, and flow cytometry assays were used to measure the ability of cell growth, proliferation and cell cycle distribution. Lentiviral infection technology was used to increase gene expression, while siRNA interfering technology was used to knockdown gene expression. Finally, nude mice were used to construct tumor-burdened models in vivo by injecting tumor cells subcutaneously. Results PCR results showed that the level of GADD45a mRNA and protein levels were lower in BC tissues than in adjacent normal tissues. After increasing GADD45a expression, both the ability of growth and proliferation of BC cells were seriously impaired. Additionally, the upregulation of GADD45a expression resulted in BC cell cycle in G2/M and S phases in a p53-regulated pathway. Conclusion GADD45a-mediated cell cycle inhibition is regulated by p53 in bladder cancer cells.
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Affiliation(s)
- Na Han
- Health Examination and Oncology Screening Center, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
| | - Fang Yuan
- Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Department of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
| | - Peng Xian
- Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Department of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
| | - Nan Liu
- Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Department of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
| | - Jianmin Liu
- Department of Otolaryngology Head and Neck Surgery, People's Hospital of Deyang, Deyang 618000, People's Republic of China
| | - Haiyan Zhang
- Health Examination and Oncology Screening Center, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
| | - Huayong Zhang
- Department of Thyroid and Breast Surgery, The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519000, People's Republic of China
| | - Kai Yao
- Department of Urology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, People's Republic of China
| | - Gangjun Yuan
- Chongqing Key Laboratory of Translational Research for Cancer Metastasis and Individualized Treatment, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China.,Department of Urology, Chongqing University Cancer Hospital, Chongqing 400030, People's Republic of China
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7
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Li D, Dai C, Yang X, Li B, Xiao X, Tang S. GADD45a Regulates Olaquindox-Induced DNA Damage and S-Phase Arrest in Human Hepatoma G2 Cells via JNK/p38 Pathways. Molecules 2017; 22:E124. [PMID: 28098804 DOI: 10.3390/molecules22010124] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/28/2016] [Accepted: 01/09/2017] [Indexed: 01/09/2023] Open
Abstract
Olaquindox, a quinoxaline 1,4-dioxide derivative, is widely used as a feed additive in many countries. The potential genotoxicity of olaquindox, hence, is of concern. However, the proper mechanism of toxicity was unclear. The aim of the present study was to investigate the effect of growth arrest and DNA damage 45 alpha (GADD45a) on olaquindox-induced DNA damage and cell cycle arrest in HepG2 cells. The results showed that olaquindox could induce reactive oxygen species (ROS)-mediated DNA damage and S-phase arrest, where increases of GADD45a, cyclin A, Cdk 2, p21 and p53 protein expression, decrease of cyclin D1 and the activation of phosphorylation-c-Jun N-terminal kinases (p-JNK), phosphorylation-p38 (p-p38) and phosphorylation-extracellular signal-regulated kinases (p-ERK) were involved. However, GADD45a knockdown cells treated with olaquindox could significantly decrease cell viability, exacerbate DNA damage and increase S-phase arrest, associated with the marked activation of p-JNK, p-p38, but not p-ERK. Furthermore, SP600125 and SB203580 aggravated olaquindox-induced DNA damage and S-phase arrest, suppressed the expression of GADD45a. Taken together, these findings revealed that GADD45a played a protective role in olaquindox treatment and JNK/p38 pathways may partly contribute to GADD45a regulated olaquindox-induced DNA damage and S-phase arrest. Our findings increase the understanding on the molecular mechanisms of olaquindox.
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Li D, Dai C, Zhou Y, Yang X, Zhao K, Xiao X, Tang S. Effect of GADD45a on olaquindox-induced apoptosis in human hepatoma G2 cells: Involvement of mitochondrial dysfunction. Environ Toxicol Pharmacol 2016; 46:140-146. [PMID: 27458702 DOI: 10.1016/j.etap.2016.07.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 07/15/2016] [Accepted: 07/18/2016] [Indexed: 06/06/2023]
Abstract
Olaquindox, a quinoxaline 1, 4-dioxide derivative, has been widely used as a feed additive for promoting animal growth in China. The aim of present study was to investigate the effect of grow arrest and DNA damage 45 alpha (GADD45a) on olaquindox-induced apoptosis in HepG2 cells. The result showed that olaquindox induced the decrease of cell viability in a dose dependent manner. Compared to the control group, olaquindox treatment at 400 and 800μg/mL increased the expression level of GADD45a protein and reactive oxygen species (ROS) production, decreased mitochondrial membrane potential (MMP), and subsequently increased the expression of Bax while decreased the expression of Bcl-2, leading to the release of cytochrome c (Cyt c). However, knockdown of GADD45a enhanced olaquindox-induced ROS production, disrupted MMP and subsequently caused Cyt c release, then further increased olaquindox- induced cell apoptosis by increasing the activities of caspase-9, caspase-3, and poly (ADP-ribose) polymerase (PARP). In conclusion, the results revealed that GADD45a played a critical role in olaquindox-induced apoptosis in HepG2 cells, which may embrace the regulatory ability on the mitochondrial apoptosis pathway.
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Affiliation(s)
- Daowen Li
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Chongshan Dai
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Yan Zhou
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Xiayun Yang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Kena Zhao
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Xilong Xiao
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China
| | - Shusheng Tang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing, PR China.
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Mathew B, Takekoshi D, Sammani S, Epshtein Y, Sharma R, Smith BD, Mitra S, Desai AA, Weichselbaum RR, Garcia JGN, Jacobson JR. Role of GADD45a in murine models of radiation- and bleomycin-induced lung injury. Am J Physiol Lung Cell Mol Physiol 2015; 309:L1420-9. [PMID: 26498248 DOI: 10.1152/ajplung.00146.2014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 08/25/2015] [Indexed: 11/22/2022] Open
Abstract
We previously reported protective effects of GADD45a (growth arrest and DNA damage-inducible gene 45 alpha) in murine ventilator-induced lung injury (VILI) via effects on Akt-mediated endothelial cell signaling. In the present study we investigated the role of GADD45a in separate murine models of radiation- and bleomycin-induced lung injury. Initial studies of wild-type mice subjected to single-dose thoracic radiation (10 Gy) confirmed a significant increase in lung GADD45a expression within 24 h and persistent at 6 wk. Mice deficient in GADD45a (GADD45a(-/-)) demonstrated increased susceptibility to radiation-induced lung injury (RILI, 10 Gy) evidenced by increased bronchoalveolar lavage (BAL) fluid total cell counts, protein and albumin levels, and levels of inflammatory cytokines compared with RILI-challenged wild-type animals at 2 and 4 wk. Furthermore, GADD45a(-/-) mice had decreased total and phosphorylated lung Akt levels both at baseline and 6 wk after RILI challenge relative to wild-type mice while increased RILI susceptibility was observed in both Akt(+/-) mice and mice treated with an Akt inhibitor beginning 1 wk prior to irradiation. Additionally, overexpression of a constitutively active Akt1 transgene reversed RILI-susceptibility in GADD45a(-/-) mice. In separate studies, lung fibrotic changes 2 wk after treatment with bleomycin (0.25 U/kg IT) was significantly increased in GADD45a(-/-) mice compared with wild-type mice assessed by lung collagen content and histology. These data implicate GADD45a as an important modulator of lung inflammatory responses across different injury models and highlight GADD45a-mediated signaling as a novel target in inflammatory lung injury clinically.
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Affiliation(s)
- Biji Mathew
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois
| | - Daisuke Takekoshi
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois; Department of Respiratory Medicine, Tohoku University Hospital, Miyagi, Japan
| | - Saad Sammani
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois
| | - Yulia Epshtein
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois
| | - Rajesh Sharma
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois
| | - Brett D Smith
- Department of Radiation Oncology, University of Chicago, Chicago, Illinois; and
| | - Sumegha Mitra
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois
| | - Ankit A Desai
- Arizona Health Sciences Center, University of Arizona, Tucson, Arizona
| | | | - Joe G N Garcia
- Arizona Health Sciences Center, University of Arizona, Tucson, Arizona
| | - Jeffrey R Jacobson
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Illinois at Chicago, Chicago, Illinois;
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Shi Q, Geldenhuys W, Sutariya V, Bishayee A, Patel I, Bhatia D. CArG-driven GADD45α activated by resveratrol inhibits lung cancer cells. Genes Cancer 2015; 6:220-30. [PMID: 26124921 DOI: 10.18632/genesandcancer.62] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 04/27/2015] [Indexed: 01/22/2023] Open
Abstract
We report anticarcinogenic effects of suicide gene therapy that relies on the use of resveratrol-responsive CArG elements from the Egr-1 promoter to induce GADD45α. In A549 lung cancer cells, endogenous GADD45α was not induced upon resveratrol treatment. Therefore, induction of exogenous GADD45α resulted in growth inhibition. Resveratrol transiently induced Egr-1 through ERK/JNK-ElK-1. Hence, we cloned natural or synthetic Egr-1 promoter upstream of GADD45α cDNA to create a suicide gene therapy vector. Since natural promoter may have antagonized effects, we tested synthetic promoter that contains either five, six or nine repeats of CArG elements essential in the Egr-1 promoter to drive the expression of GADD45α upon resveratrol treatment. Further analysis confirmed that both synthetic promoter and natural Egr-1 promoter were able to “turn on” the expression of GADD45α when combined with resveratrol, and subsequently led to suppression of cell proliferation and apoptosis.
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Scott H, Walmsley RM. Ames positive boronic acids are not all eukaryotic genotoxins. Mutat Res Genet Toxicol Environ Mutagen 2014; 777:68-72. [PMID: 25726177 DOI: 10.1016/j.mrgentox.2014.12.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 12/04/2014] [Accepted: 12/05/2014] [Indexed: 12/20/2022]
Abstract
Boronic acids and their derivatives have been exploited for their pharmacological activity and their utility as intermediates in the synthesis of novel non-boron containing compounds. A recent study reported that boronic acids are bacterial mutagens. Here, results are reported from the testing of nine boronic acids using the pan-mechanistic eukaryotic GADD45a genotoxicity assays, BlueScreen HC and GreenScreen HC. Positive results were produced for one compound in GreenScreen and four compounds in BlueScreen. Only negative results were produced when tested with S9 metabolic activation. These data suggest that there is not a general genotoxic liability in eukaryotes, within this chemical domain. Furthermore, they are not potent eukaryotic genotoxins: positive results were produced only at concentrations between 1mM and 10mM. Their presence as low concentration contaminants or impurities would be unlikely to produce misleading positive results for a test material.
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Affiliation(s)
- Heather Scott
- Gentronix Ltd., BioHub at Alderley Park, Cheshire, SK10 4TG, United Kingdom
| | - Richard M Walmsley
- Gentronix Ltd., BioHub at Alderley Park, Cheshire, SK10 4TG, United Kingdom; Faculty of Life Sciences, University of Manchester, M13 9PL, United Kingdom.
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